In VIC stratas, there are implied easements for common and lot services due to the Subdivisions Act 1988, particularly s.12(2).
It means that the common property and the lots have easements over each other for the supply of their services. A lot’s service infrastructure can cross both common property and another lot property. The same with common service infrastructure. In VIC, lots are responsible for their services once they exclusively service the lot – regardless of their location. So the lot needs the easement in order to maintain their service. The implied easements are created when the strata plan is first registered. The lots and the OC don’t get to automatically add new implied easements however and existing implied easements will probably be difficult to remove.
A service provider can require that some or all of its service supply infrastructure is placed on common property. That’s the case today for electricity meters. But it might not have been the case decades ago. In any event, it seems the electricity distributor is OK with the present arrangement.
To get it changed at OC expense, the OP would probably have to challenge the fairness of the implied easement. That I think would be difficult to do if the easement has existed for decades.